Numerical simulation on undrained triaxial behavior of saturated soil by a fluid coupled-DEM model

Guang, Liu; Guan, Rong; Peng, Jun; Zhou, Chuangbing

doi:10.1016/j.enggeo.2015.04.019

Cited by 50 publications

(12 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By adjusting the relevant simulation parameters, the numerical simulation has similar macroscopic behavior with a series of laboratory tests, then the selected micromechanical parameters will be calibrated. [59][60][61][62][63] In this study, the triaxial compression test that is an effective method to validate the mechanical characteristics of simulated soil and the corresponding numerical simulation are used to calibrate the required micromechanical parameters of the DE road model. Figure 8.…”

Section: Parameters Calibration Of De Road Modelmentioning

confidence: 99%

Numerical analysis on tractive performance of off-road tire on gravel road using a calibrated finite element method–discrete element method model and experimental validation

Zeng

Yang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

The interaction between off-road tires and granular terrain has a great influence on the tractive performance of off-road vehicles. However, the finite element method or the discrete element method cannot effectively study the interaction between off-road tires and granular terrain. The three-dimensional combined finite element and discrete element method is applied to handle this problem. In this study, a calibrated finite element method–discrete element method model is established, in which the finite element model of off-road tire is validated by stiffness tests, while the discrete element model of gravel particles is validated by triaxial compression tests. The calibrated finite element method–discrete element method model can describe the structural mechanics of the off-road tire and the macroscopic mechanical properties of the gravel road. Tractive performance simulations of the off-road tire on gravel road under different slip conditions are performed with the commercial software LS-DYNA. The simulation results are basically corresponded with the soil-bin test results in terms of granular terrain deformation and tractive performance parameters versus the slip rates. Finally, the effects of tread pattern, wheel load, and tire inflation pressure on tractive performance of off-road tire on granular terrain are investigated. It indicates that the calibrated finite element method–discrete element method can be an effective tool for studying the tire–granular terrain interaction and predicting the tractive performance of off-road tire on granular terrain.

show abstract

Section: Parameters Calibration Of De Road Modelmentioning

confidence: 99%

Numerical analysis on tractive performance of off-road tire on gravel road using a calibrated finite element method–discrete element method model and experimental validation

Zeng

Yang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…In the PFC model input, it is difficult to directly obtain the micro parameters in laboratory. The PFC model parameters are calibrated by matching the macro mechanical properties of the simulated rocks with the experiment data [25][26][27], therefore, the trial and error method was used to determine the micro parameters for PFC modeling by comparing the stress-strain curve, UCS and axial strain at peak stress.…”

Section: Mechanism Of Strength Enhancementmentioning

confidence: 99%

Coal Strength Development with the Increase of Lateral Confinement

Zhang

2019

Energies

View full text Add to dashboard Cite

The high stress environment brings many challenges in underground coal mining. In order to address the strength behavior of coal under various confining stresses and hence shed light on coal pillar design optimization, compressive tests were conducted under the lateral confinement of 0–8.0 MPa, and the strength enhancement mechanism was studied from the grain scale using PFC modeling. The results show that the coal strength and cumulative axial strain at failure increased with the confinement, while the Young’s modulus of coal is independent of confinement. However, this confinement-dependent strength property can be significantly weakened by existing cracks. Compared to the significant increase in peak compressive stress, the crack initiation stress slightly increased with the confinement. The strength component mobilized with the confinement enhancement. In the early stage of loading, the high confinement restrained the development of microcracks, while in the later stage, it enhanced the frictional resistance strength component. The two mechanism shifted the compressive strength of coal together and the latter one contributed to the strength component mobilization. The coal showed three failure modes sequentially with the increase of confinement, namely axial splitting, mixed failure and shear failure mode. With regard to failure envelope, the Mohr-Coulomb, Hoek-Brown and S-shaped failure criteria can generally represent the confinement-dependent coal strength with R-square larger than 0.9. The confinement of rapid strength promotion section of S-shape failure envelope falls in a range of 1.5–3.0 MPa. This leads to the difficulty of S-shaped failure envelope justification due to the soft nature and heterogeneity of coal.

show abstract

“…To observe the accuracy of the behavioral pattern's performance for the drained static state, use was made of the results of a standard triaxial test by Guanglia et al [12]. According to the results obtained from Figure (7), it is observed that the stress reaches the Mohr-Coulomb line under confining 50kPa pressure on planes 14, 15, 16 and 17 before the other planes hence the stretch of the contingent failure planes will be as shown in FRigure (13).…”

Section: Findings: 1) Validation Of the Behavioral Model's Performance For Static Statementioning

confidence: 99%

Crack Detection in Earth Dams upon a Multiline-Multilaminate Model

Dadgar¹,

Arjomand²,

Arefnia³

2019

IJET

View full text Add to dashboard Cite

Earth dams exhibit complex behaviors under various loads and the daily increasing development of the earth dams has made researchers more accurately investigate the soil's mechanical properties including the stress-strain relations and related stress paths. The present study takes advantage of a Multi-Laminate theory to achieve a model that is capable of predicting crack propagation in earth dams on every arbitrary path. The numerical analysis is conducted herein using the finite element method through taking 17 micro scale planes into account. It is by the use of a Multi-Line pattern within the format Multi-Laminate theory for a point in drainage mode that the materials' behaviors have been predicted with a maximum error rate of 13%. It was made clear in this mode that the failure is highly likely to occur on planes 14, 15, 16 and 17 followed by planes 1, 2, 3, 4, 5, 6, 7 and 8that are deemed active, respectively. In normal stress states of the strain, planes 9, 10, 11, 12 and 13 were also found active besides the abovementioned planes.

show abstract

Numerical simulation on undrained triaxial behavior of saturated soil by a fluid coupled-DEM model

Cited by 50 publications

References 33 publications

Numerical analysis on tractive performance of off-road tire on gravel road using a calibrated finite element method–discrete element method model and experimental validation

Numerical analysis on tractive performance of off-road tire on gravel road using a calibrated finite element method–discrete element method model and experimental validation

Coal Strength Development with the Increase of Lateral Confinement

Crack Detection in Earth Dams upon a Multiline-Multilaminate Model

Contact Info

Product

Resources

About